Patent GB-540174-A (GB)
Title: Improvements in or relating to shoe upper conforming machines
IPC: A43D21/16
Filed: 1940-03-05
Abstract: 540,174. Lasting machines. BRITISH UNITED SHOE MACHINERY CO., Ltd. (United Shoe Machinery Corporation). March 5, 1940, No. 4063. [Class 17 (i)] Machines of the kind described in Specification 520,194 are improved. A device is provided for heating cement previously applied for securing the upper in lasted relation to the insole. The machine is automatically stopped when the heating device has been applied to the cement, and is automatically started again after an adjustable pre-determined interval. Before over-wiping commences the heating device serves as a hold-down for the toe end of the insole. During over-wiping the device functions as a retarder, clamping the margin of the upper against the wipers as these advance. The shoe is yieldably movable heightwise, in response to the pressure of the wipers during over-wiping, against a weak spring, and, thereafter, by a strong spring, to press the upper margin firmly against the insole. The shoe is positioned by a plate engaging the fore-part of the insole, the plate carrying pins engaging holes in the last. Alternatively, a gauge engages the toe end and others are adjacent the sides of the last. The initial pull of the grippers is rapid, but their movement slows during up-wiping. A shoe positioning plate 8 has lugs at toe-end and sides to position the fore part of the shoe, and pins 12 entering holes in the last. The plate is interchangeable on withdrawal of a spring- pressed pin 24, and is carried by a rod 18 camactuated as described in the prior Specification. The toe rest is carried by a rod 38 urged upwardly by a weak spring 86 and a pair of strong concentric springs 54, 56 abutting against washers each carrying pins 72, 74 guided in holes in a plate 80 and co-operating with holes in a disc 58 adjustable about the rod 38. By adjusting the disc either set of pins, or both sets, may abut against it to support the toe rest when the wipers are pressed downwardly on the upper margin at the conclusion of the overwiping. The weak spring 86 supports the toe rest during over-wiping, and is cut out at the end thereof by cam-operated pawls 104 cooperating with ratchet teeth 102. A cylindrical member 140 is electrically heated, and carries an inter-changeable horse-shoe shaped plate 146. The heated member is guided by parallel links 152, 166, one of the latter having a projection co-operating with a notch in a link 174 pivoted to a cam-operated rock-shaft, which lifts the plate when over-wiping is complete. The members 142, 146 are bevelled to co-operate with the wipers and thus act as a retarder as the wipers advance. In order that thermo-plastic cement may be adequately heated, the machine is automatically stopped at the conclusion of the overwiping movement, clutch faces 206, 208 being separated by a yoke 218 swung by upward movement of a block 230 engaging a latch 226. The block 230 is carried by a cam-actuated link 232, and also carries a pin 250 co-operating with a step on a link 248 pivoted to a treadle. The link 232 carries a second pin 286 co-operating with a step on a link 284 pivoted to the rod of a piston 270 which serves to start the machine again after a pre-determined interval. At the conclusion of over-wiping, a valve 310 is set to direct oil, normally pumped to various lubricating passages, to a pipe 314 leading to the cylinder 272, an adjustable needle valve 318 determining the rate of flow. The alternative means for positioning the shoe comprise toe end gauges 358 carried in substantially parallel links 364, 374 raised as the wipers swing upwardly by contacts 380, 382 so that the gauges are out of the way. The position of the sides of the last is indicated by sight with the help of gauges 388 formed with rack teeth engaged by a pinion rotated by a head 400 so that the gauges may be moved towards or away from each other in unison to adjust them for width of shoe.